Room-temperature ferromagnetism in Mn-implanted TiO2

被引：6
|
作者：
Menzel, D. [1 ]
Jursic, I. [1 ]
Schoenes, J. [1 ]
Iacomi, F. [2 ]
Cacaina, D. [3 ]
机构：
[1] Tech Univ Braunschweig, Inst Phys Kondensierten Mat, Mendelssohnstr 3, D-38106 Braunschweig, Germany
[2] Al I Cuza University, Fac Phys, Iasi 700506, Romania
[3] Babes Bolyai Univ, Fac Phys, Cluj Napoca 4084, Romania
来源：
PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 3, NO 12 | 2006年 / 3卷 / 12期
关键词：
D O I：
10.1002/pssc.200672817
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
TiO2 single crystals were doped with Mn using the ion implantation technique at high doses leading to Mn concentrations of up to 7 at.% Mn. The Mn-doped TiO2 orders ferromagnetically above room temperature. The magnetic moment of the as-implanted samples (0.3 mu(B) per Mn) is reduced after thermal annealing at 400 degrees C under oxygen atmosphere due to a reduction of the oxygen deficiency. The moment recovers after annealing at higher temperatures reaching 0.4 mu(B) per Mn which indicates the incorporation of Mn atoms on substitutional sites. Electron spin resonance measurements show two types of signals which are independent of the orientation of the magnetic field corresponding to Mn2+ and Mn2+-O-Mn2+. In addition, four lines are strongly dependend on the orientation of the magnetic field and can be attributed to Mn4+.
引用
收藏
页码：4119 / 4122
页数：4
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